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Royalty Clerk

Texas oil lease · RRC district 04 · Lease 02826

Producing

SERNA, REFUGIO

Serna, Refugio is an oil lease in Duval County, Texas, operated by Serna Inc. in the Seven Sisters field. The Railroad Commission shows 2,352 bbl of oil in the 12 months through Jul 2026.

Oil lease dossier · 3 wells

2,352bbl oil, last 12 months+15% vs prior year
Operator
Serna Inc.
County
Duval County
Field
Seven Sisters
RRC lease
04-02826

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Where it sits

This county

Duval CountyDuvalJim WellsDuval County
Duval County · RRC district 04Open Duval County →
Oil in Jul 2026
231 bbl
Reporting to the state
since Jan 2020
Wells
3
Data through
Jul 2026

Production

Month by month, from the state record

What the Railroad Commission says this oil lease produced. Oil is in barrels (bbl). Gas is in thousand cubic feet (mcf).

Oil output rose 15% over the last 12 months

2,352 bbl in the 12 months through Jul 2026, against 2,043 bbl in the 12 months before.

  • Oil (bars, left axis)
  • Last 12 months
Oil output rose 15% over the last 12 monthsMonthly oil production for SERNA, REFUGIO, Aug 2023 to Jul 2026. Oil output rose 15% over the last 12 months. 2,352 bbl in the 12 months through Jul 2026, against 2,043 bbl in the 12 months before.Last 12 months: 2,352 bblbbl per month050100150200250Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output rose 15% over the last 12 monthsMonthly oil production for SERNA, REFUGIO, Aug 2023 to Jul 2026. Oil output rose 15% over the last 12 months. 2,352 bbl in the 12 months through Jul 2026, against 2,043 bbl in the 12 months before.Last 12 monthsbbl per month050100150200250Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 02826, district 04. Reported through Jul 2026. The state revises recent months.

Gas disposition

Where the gas went

Every month the operator tells the state where each mcf of gas went, using a code. The code decides how your gas is paid.

No gas disposition reported for this lease

The operator has not reported where the gas went in the months we hold.

Operator history

Who has run this lease

The operator runs the wells and pays your royalty. When the operator changes, payments often slip for a month or two.

Serna Inc. has reported this lease for the whole period

No change of operator in the months we hold.

Operators of this lease over timeSerna Inc., Jan 2020 to Jul 20262020202120222023202420252026Serna Inc.Jan 2020 to nowthrough Jul 2026
Operators of this lease over timeSerna Inc., Jan 2020 to Jul 20262020202120222023202420252026Serna Inc.Jan 2020 to nowthrough Jul 2026

SourceTexas Railroad Commission Production Data Query, operator by month. Reported through Jul 2026.

Wells

3 wells on this lease

Every well the Railroad Commission links to oil lease 02826 in district 04. The API number is the state’s ID for a well.
Wells on SERNA, REFUGIO
API numberWell no.Status
42-131-007346Active
42-131-007532Active
42-131-105299Active

SourceTexas Railroad Commission Wellbore Query, district 04, lease 02826.

Who buys and gathers

Who moves and buys this lease's production

The operator files a Form P-4 with the Railroad Commission naming the companies authorised to gather and buy the oil and gas. The buyer's price is the one your royalty is figured on.

  • Oil

    Gulfmark Energy, Inc. gathers it.

    100% of it, on the list since Jun 30, 2021

Companies that used to be listed: Shell Trading (Us) Company (gathers it, until Jun 30, 2021).

SourceRailroad Commission of Texas, Form P-4 file, dated Sep 24, 2026 (source). A listed company is authorised to move or buy the production; the state does not say what it paid.

Who buys my oil and gasIs my oil price fair?

Unit and wells

What the drilling permits say

Acres and wells as the operator filed them on its Railroad Commission drilling permits. Your decimal is your net acres over the unit acres, so this is the number to hold your division order against.
Wells on the permits
76 not plugged
Horizontal
0
First completion
Feb 26, 1962
Latest permit
–

7 wells are listed on this lease

Each well can have its own unit. The decimal for one well does not have to equal the decimal for another.

Wells and acres on the permits for Serna, Refugio
API numberWell no.Acreson the permit
42-131-007346–
42-131-007532–
42-131-054185–
42-131-105267–
42-131-105299–
42-131-810983–
42-131-811008–

SourceRailroad Commission of Texas, drilling permits and wellbore file, Sep 26, 2026 (source 1, source 2). The acres are what the operator filed; they are not a survey.

Check my decimal against the unit

Estimator

Estimate your royalty for this lease

A rough check before you look at a statement: the state volumes times your decimal, priced at WTI and Henry Hub.

Estimator

What could your check be?

Your decimal interest is the small number on your division order that says what share of the whole lease (8/8ths) is yours. Type it in and we apply it to what the state says SERNA, REFUGIO sold each month.

For example 0.00097656, or a fraction like 1/1024.

Dollars per barrel. Your statements show the gap your operator uses. Leave 0 to price oil at WTI.

Your estimate appears here

Enter your decimal to see an estimated royalty for each of the last 12 months this lease reported. Nothing you type leaves your browser.

An estimate, not your check

It ignores gathering and processing fees, taxes, plant products and the price your operator actually gets, so your statement will differ. Use it as a ceiling to compare against.

Ledger

36 months, newest first

Compare these numbers with your statements. Your share of a month is the “Oil sold” volume times your decimal. Scroll sideways on a phone.
Monthly production, disposition and prices for SERNA, REFUGIO
MonthOil producedbblOil soldbblWTI$ per bblHenry Hub$ per MMBtu
Jul 2026Serna Inc.231157$80.46$2.89
Jun 2026Serna Inc.230283$84.81$3.15
May 2026Serna Inc.155155$102.13$2.94
Apr 2026Serna Inc.231158$100.32$2.77
Mar 2026Serna Inc.191291$91.38$3.04
Feb 2026Serna Inc.166139$64.51$3.62
Jan 2026Serna Inc.216163$60.04$7.72
Dec 2025Serna Inc.217310$57.97$4.26
Nov 2025Serna Inc.152157$60.06$3.79
Oct 2025Serna Inc.167162$60.89$3.19
Sep 2025Serna Inc.150160$63.96$2.97
Aug 2025Serna Inc.246161$64.86$2.91
Jul 2025Serna Inc.185153$68.39$3.20
Jun 2025Serna Inc.221308$68.17$3.02
May 2025Serna Inc.121159$62.17$3.12
Apr 2025Serna Inc.226155$63.54$3.42
Mar 2025Serna Inc.193144$68.24$4.12
Feb 2025Serna Inc.207302$71.53$4.19
Jan 2025Serna Inc.1030$75.74$4.13
Dec 2024Serna Inc.44144$70.12$3.01
Nov 2024Serna Inc.146146$69.95$2.12
Oct 2024Serna Inc.205150$71.99$2.20
Sep 2024Serna Inc.203153$70.24$2.28
Aug 2024Serna Inc.189289$76.68$1.99
Jul 2024Serna Inc.242157$81.80$2.07
Jun 2024Serna Inc.203310$79.77$2.54
May 2024Serna Inc.1070$80.02$2.12
Apr 2024Serna Inc.162289$85.35$1.60
Mar 2024Serna Inc.218158$81.28$1.49
Feb 2024Serna Inc.207156$77.25$1.72
Jan 2024Serna Inc.196319$74.15$3.18
Dec 2023Serna Inc.196157$71.90$2.52
Nov 2023Serna Inc.177150$77.69$2.71
Oct 2023Serna Inc.219146$85.64$2.98
Sep 2023Serna Inc.228312$89.43$2.64
Aug 2023Serna Inc.670$81.39$2.58

No report filed More than 3% of gas flared

SourceVolumes: Texas Railroad Commission Production Data Query, reported through Jul 2026. Prices: EIA WTI Cushing spot and Henry Hub spot, monthly, through Aug 2026. “Gas sold” is gas sent to a transmission line (code 2) or a plant (code 3).

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Upload your statements for SERNA, REFUGIO. We compare volumes, prices, deductions and timing with the state record and give you the exact question to ask Serna Inc.

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Around this lease

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Everything on this page connects to the operator, field and county records. Start from any of them.

This lease belongs to

OperatorSerna Inc.FieldSeven SistersCountyDuval County

Serna Inc. in Duval County

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Seven Sisters field

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Leases within 10 km

Found by the location of their wells.

Drilling permits within 10 km

How to read this page

Questions owners ask

What is a decimal interest?

It is your share of the whole lease, written as a decimal. A 1/4 royalty on 5 net acres in a 1,280-acre unit is 1/4 × 5 ÷ 1,280 = 0.00097656. Your division order states yours.

How do I use this page to check a royalty check?

Take the “Oil sold” volume for the month the check covers and multiply it by your decimal. The answer should match the barrels on your statement. If it does not, upload the statement and we will show where the two differ.

Why is the newest month Jul 2026?

The Railroad Commission publishes production two to three months after the fact and revises recent months. We re-pull the latest three months on every update.

Does this page show what my check should be?

No. It shows what the state recorded. Prices, fees and taxes depend on your lease and on what your operator gets for the oil and gas. The estimator gives a ceiling to compare against.

Sources and method

Where these numbers come from

  • Production and disposition by month: Texas Railroad Commission Production Data Query, oil lease 02826, district 04, reported through Jul 2026.
  • Wells: Texas Railroad Commission Wellbore Query.
  • Prices: U.S. Energy Information Administration, WTI Cushing spot and Henry Hub spot, monthly.
  • Page updated Sep 28, 2026.

We show the state’s numbers as filed. Where the state has no report for a month, we say so instead of guessing.